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v PROCESS 0F MAKING PAPER BAGS. 310.517,61?. Patented Apr. 3, 1894.

Wineses nifenr UNITED STATES PATENT OFFICE. f

H. WALKER,

TRUSTEE, OF SAME PLACE.

PROCESS OAF MAKING PAPER BAGS.

SPECIFICATION forming part of kLetters Patent N o. 517,617,

dated April 3, 1894.

Application fled August 18 ,1892. Serial N o. 443,359. (No specimens.)

.To asZZ'wh/om it may cocern .13e it known that I, WILLIAM A. LORENZ, a citlzen of the United States, residing at Hartford, 1n the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Processes of Making Paper Bags, of which the following is a full, clear, and exact specification.

his invention is a new and useful process of making square-bottomed paper bags from tucked tubing, which bags have novel folds 1n the bottom. t

Figure lis a plan View of a length of tucked paper tube'such as is well known in the art of making paper bags; in this view are also 3 are side and end spectively of what is shown in is a plan View of the blank of 3, after the first folding of the bottom new process has been partly performed thereon; and Fig. 5 is a view of the lower edgeof F1g. 4, with the various instrumentalities in section. Fig. 6 is a plan view of the blank of Figs. 4 and 5, when the lfirst folding of the bottom has been completed and paste has been applied to it, and lower edge of Fig. 6. Fig. 8 is a plan view of the blank of Figs. 6 and 7, after the forward flap has been folded over upon the bottom of the blank, and pressed thereon, thus completlng the bag. Fig. 9 is a view of the lower edge of Fig. 8. Fig. l0 is a View of the bottom of the interior of the bag of Figs. 8 and bag has been expanded. Fig. 11 view of the completed bag, opened out 1nto a rectangular form. Fig. 12 1s a perspective view, showing the blank, and

views re- Fig. l. Figs. 1,

e plates and grippers in the position shown 1n Figs. 4 and 5.

The following is a description of my new process: A plate, 1, is placed upon the blank, .2, wlth its forward edge at the line a-b, leaving a sufficient amount of the blank beyond I that edge to produce the bottom of the bag.

pair of bevel-pointed plates, 3 and 4, are lnserted into the tucks, 5 and 6, of the blank,

2, the beveled edge of the plates crossing the edges of the lower plies, 7 and 8, of that blank at theline cmd, at a distance beyond the front l edge of the Fig. 7 is a view of theV plate 1, equal to the depth of the tucks 5 and 6. f A pair of beveled grippers, 9 and 10, are applied to the blank, as shown in Figs. 1 and 3, with their beveled edges crossing the edges of the blank at the line e-f of Fig. V1, which in that view is superimposed upon, and coincides with, the line and. The grippers 9 and 10 are then grasped so as to hold the upper plies 1l and 12 and the portion 1l, 12a of the uppertuck plies. Keeping them in a horizontal position thel grippers are raised and carried backward, so that the upper plies are foldedI backward at the line a-b, against the front edge of the plate l, and are folded forward upon the line e-f drawn between the points where the beveled edges of the grippers cross the outer edges of the plies. That motion of the grippers is continued until the line e.. f. has been made to describe an arc of one hundred and eighty degrees about ther line a-b, passing through the position shown in.

Figs. 4 and 5 to that shown in Figs. 6 and 7.

The various instrumentalities are then removed and the blank appears asin Figs. 6 and 7, having two triangular shaped portions 11u and 12a lying upon the folds 13 and 14. During the operation just described the lower plates 3 and 4 may be slightly depressed as seen in Fig.r5 to facilitate the forming of the triangular folds 13 and 14. It is also preferable to crease the blank before folding, on the line c-d, eand on the diagonal lines which define the triangular folds 13 and 14. Paste is then applied` at 15, on the forward part of the blank, and at 16, 17, under the lip 18 of the blank 2. The paste at 16 and 17 may be applied to the blank uponthe lip 18 previous to anyfolding of the bottom, and while the blank is in tuck tube form.

The next step in the folding of the bottom consists in folding the forward flap, 19, over on the line c-d and pressing it down upon the bottom of the bag so as to securely cement it together, th us completing it fully, as shown in Figs. 8 and 9. l p

The last step in the completion of the bottom of the bag maybe slightly modified by entering the forward part, 20, under the part 21 of the bottom of the blank, instead ofv over it; but in this case the paste should be omitted from the forward part of the iiap 19, and

paste should be applied entirely across, under` tucked tube, which consists in first folding one the lip 18. The iiap 19 may also be variously end of the upper ply of the tube together with slitted to produce slightly modified forms, the upper plies of the tucks over upon thebody 15 Without departing from the spirit of the inof the blank, thus producing the folds ll and 5 vention. l2a over the triangular folds 13 and 14:, and

The characteristic features of this process then completing the rectangular bottom of the consist of the steps which are taken in foldbag by folding over the forward Hap; all subing the blank of Figs. l, 2 and 3 into the blank stantially as described. of Figs. 6 and '7, and from that blank into the Io completed bag of Figs. 8 and 9. Witnesses:

I claim as my invention EDWARD E. CLAUSSEN, That process of making a paper bag from a RALIH M. GRANT.

VILLIAM A. LORENZ. 

